In creative mode, if you fly vertically into a block above your head, then press and release shift while continuing to hold the spacebar, you will phase into that block.
Related issues
Comments
migrated
MC-92397
Phase through blocks in creative mode
Resolved
Duplicate
0
migrated
migrated
(Unassigned)
Unconfirmed
Minecraft 15w44b, Minecraft 15w45a
Retrieved
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-90594. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.