An Indoor/Outdoor Breakfast Bar allows you to seamlessly break down the barrier between inside and outside. Friends can sit and chat while the cook whips up a storm, plus it's a beautiful place to enjoy an alfresco snack without feeling detached from everyone in the home.
Gargae doors that can (with the touch of a button) lift out of the way are a great way to effortlessly open your home to the outdoors when the wetaher is good.
Who wouldn't love to huddle around a roaring open fire like these? And when it helps to connect the indoors and outdoors, all the better! The success of these examples is that the fireplace ancors the opening to the outdoors to really draw people out.
Rather than just a regular opening to the outdoors, an opening that disolves two corners of the house really enhances the indoor/outdoor connection, making the inside and outside feel like one.
Similarly, opening two opposite walls makes the room feel more like a sheltered outdoor space than a internal room. Combine with a creek (or less elaborate water feature) for maximum effect.
Nothing makes the connection between indoors and outdoors more seamless than using the same material inside and out. If you're using timber, stone or concrete inside, it can easily be extended outside to blur the boundaries. The effect is enhanced further by ensuring the surfaces inside and outside are on the same plane, no steps means no sense of the boundary (and allows for effertless tricycling)!
Even if your room is completely enclosed, the use of glazing can make it feel like its part of the outdoors. Especially good for cooler climates, a small room like this dining area completely surrounded by glass can make you feel like reaching out and touching nature (without the potential frost-bite).
If you really can open up to nature, consider bringing a bit of nature indoors. A simple potted indoor plant can make a room feel much more connected to nature, but if you really want the full effect, consider a full green wall like in this luxurious bathroom.