These shelves show the importance of spacing. The empty space is very easy on the eyes. I don't even know what these things are (do I see a group of marble chalices? What am I looking at?) but it doesn't matter, because they are all made of the same material and this room is seriously sexy.
It is possible to be a collector and not a clutterer! Because all of the objects are the same color and literally kept in line by the shelves, they work together as a group.
Play around with arranging groups of similar objects, like these curvaceous vases. I doubt the person who arranged them nailed it on the first try.
Grouping a variety of items in similar containers is another way to keep things looking orderly...
Have a place for everything, and keep everything in its place.
Specific pieces of furniture were made for collectors. If you've got a sideboard with plate racks, bring out your goods and show them off. They don't all have to be the same color like this photo.
These wooden bowls come in a variety of shapes, sizes and colors, but the material they have in common with each other (and the shelves and the table) keeps things copacetic. I think that's the first time I've ever used the word "copacetic" on Houzz.
The people who lived in this house are architects who filled their home with artfully arranged collections. This wall of masks stopped me in my tracks.
Sometimes a vertical line is the way to go.
A repetitive pattern is created like these cups. It emulates the pattern of the beautiful Heath Ceramics tile above.
This designer knows how to have fun with a bathroom. Vintage oversized perfume bottles and vintage pharmacy ephemera all work well together. The key here is the empty space; it keeps things in balance. Again, arrange take a step back, fold your arms, contemplate, and re-arrange until it feels right.