Oblong dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — Tony Crisp

An area of our expenence—might be sex, mind, etc.; boundaries of our awareness or what we dare let ourselves experience, physical reality.
Source: A Guide to Dreams and Sleep Experiences Author: Tony Crisp

Interpretation 2 — Joan Seaman - Tom Philbin

Odd shape signifies something is not quite right in what the dreamer is observing.
Source: New American Dream Dictionary Author: Joan Seaman - Tom Philbin